carb problem?

[simonbonser]

I have recently bought a vx 1600 which drives fine so long as its accelerating however if I try to drive at a constant speed at revs below 4000rpm then the car starts to act like their is an intermitent fuel starvation problem - it bunny hops- this happens hot or cold.

 

Do the carbs need balancing ? or is there another problem ?

 

Any advice welcome

 

 

[Super_Rich_Bernie]

I posted up some similar symptoms a week or so ago - but on an Alfa 1750 rather than X-flow.

 

Advice suggested looking at the progression drillings, but in my case these wrer as they should be (as per Alfa spec) further investigation revealed someone had fitted idle jets from a 2 litre Alfa, and this seems the likely cause.

 

If you take a look at the Dave Andrews website where he expalins Weber jetting you will see that the idle jets are actually critical when running on a small throttle - too rich and you get that bunny hopping.

 

In my case the 2litre idle jets are richer than the 1750, and I'm hoping a change back will yield improvements.

 

Jonathan

 

 

[Roger King]

Quite frankly, the standard jetting these engines were sent out on is dreadful in my opinion.

 

Chris Wheeler in the 7Workshop has an alternative jet setting that transforms the car.

[simonbonser]

Thanks for advice

 

Need to keep the jets as they are as I intend to race the car in Graduates next season - sounds like the carbs are running to rich though